Motor driven fluid pump



NOV. 8, s, A M055 l,886,74

MOTOR. DRIVEN FLUID PUMP Filed Aug. 13. 1929 IHR? Inventor: Sarword A. Moss,

I-l is Anuovneg.

Patented Nov. 8, 1932 UNITED STATES PATENT OFFICE SANFORD A. KOSS, F LYNN, ILASSACHUSETTB, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK Moron. DRIVEN FLUID PUMP Application illed August 13, 1929. Serial No. 385,556.

The resent invention relates to motor driven uid pumps.

One obj ect of the invention is to provide an improved construction and arrangement in a pump of this character which is simple and compact and wherein the necessity for a separate base and stung boxes for the pump and the necessity for a coupling between the motor and pump is eliminated. f

A further object of the invention is to provide an improved construction wherein the fluid pumped serves as a cooling medium for the motor.

For a consideration of what I believe to be novel and my invention, attention is directed to the following specification and claims appended thereto.

In the drawing, Figure 1 is a sectional view of a motor driven fluid pump embodying my invention, and Figure 2 is a detailed sectional view.

Referring to the drawing, 1 indicates a motor which drives the pump. It may be of any suitable construction. In the present instance it is shown as being an electric motor, 2 indicating the shaft of the motor which carries the armature, and 3 indicating the winding. The end of the motor casing is provided with a detachable head 4 in which is located a bearing 5 for one end of shaft 2, a ball bearing being illustrated in the present instance. Bearing 5 is held in place by a bearing housing 6 fastened to the motor head by bolts 7. Head 4 is provided with a sleeve or extension 8 through which the end of shaft 2 projects and mounted directly on the projectin end of shaft 2 is an impeller 9 of any suita le type, the impeller being keyed to the shaft and held against axial displacement by a nut 10.

Formed integral with head 4 is a surrounding wall 11 and formed integral with sleeve 8 is an end wall 12. Walls 11 and 12 define with head 4 and sleeve 8 an annular chamber 13 which surrounds the bearin and sleeve 8 directly adjacent to head 4. 3olted directly to wall 11 is a cover plate 14 which forms the outer casing wall of the pump. It is provided at its central portion with an inlet conduit 15 to which a supply pipe 16 for the pump is connected. Walls 12 and 14 form a diffuser or .annular discharge passage 16a through which` fluid from impeller 9 is discharged. This diffuser may be of the type disclosed in the patent to Moss and Robinson 1,617 133,A granted February 8, 1927. At its periphery the diffuser communicates with annular chamber 13. Annular chamber 13 forms the discharge scroll for the pump and connected to it is the discharge conduit 17. i In order to prevent leakage of the fluid being pumped to the bearing 5, I provide a seallng means comprising the spaced packing members 18 which provide inwardly facing annular pockets 19 and 20. The. packing members 18 are provided with packing teeth 65 wh1ch pack against a sleeve 21 which forms a part of shaft 2. The annular pocket 19 is connected by a conduit 22 to atmosphere while the annular pocket 20 is `connected by a conduit 23 and a pipe 24 to the suction side of 'lo the pump. With this arrangement, there obtalns 1n pocket 19 a pressure higher than that 1n pocket 20 so that there will be a certain amount of leakage of air from pocket 19 to pocket 20. At the same time, there will be some leakage of the fluid being pumped from the rear side of the impeller to pocket 20. However, due to the leakage of the air from pocket 19 to pocket 20, leakage of fluid being pumped from pocket 2O to pocket 19 is pre- 80 vented. I may however use some other form of sealing means.

25 indicates a conduit through which grease is supplied to the bearing and 26 indicates a. fixture to which a grease gun may be connected.

In the operation, the impeller draws in Huid to be pumped through inlet 15 and discharges it radially through diffuser 16a to discharge scroll 13 from which the fluid flows out 90 through discharge conduit 17. In flowing through discharge scroll 13, the fluid is brought directly into contact with head 4 and serves to remove heat from the motor. Also, the Huid serves to keep the bearing 5 95 cool. Since the impeller is overhung on the end of the motor shaft, no coupling is required and the pump itself requires no additional bearings. By arrangin the discharge scroll around the bearing, t e impeller is brought up close to the bearing so as to re' duce the overhang to a minimum. The ump is supported entirely from the motor ame or casing which means that special supporting feet are not required for the pump. 5 What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a pump structure, the combination of a motor comprising a head, a bearing in the head and a shaft supported in and projecting 1*) beyond said bearin an impeller mounted on the projecting sha end, a discharge scroll surrounding said bearing directly adjacent to and in front of said head whereby the head forms a side wall of the discharge scroll, and walls forming a conduit for conveying fluid being pumped from the impeller to said scroll.

2. In a pump structure, the combination of a motor comprising a head, a bearing in the head and a shaft supported in and projecting beyond said bearing, an impeller mounted on the projecting shaft end, a discharge scroll surrounding said bearing directly adjacent to and in front of said head whereby the head forms a side Wall of the discharge scroll, and walls forming a diffuser for conveying fluid pumped from the impeller to said scroll.

3. In a pump structure, the combination of a motor comprising a head, a bearing in the head and a shaft supported in and projecting beyond said bearing, an impeller mounted on the projecting shaft end, a discharge scroll surrounding said bearing directly adjacent to and in front of said head whereby the head forms a side wall of the discharge scroll, walls forming a conduit for conveying fluid being pumped from the impeller to said scroll, and packing means for preventing leakage of 4 fluid along the shaft to said bearing.

4. In a pump structure, the combination of a motor comprising a head, a bearing in the head and a shaft supported in and projecting beyond said bearing, an impeller mounted on the projecting shaft end, a discharge scroll surrounding said bearing directly adjacent to said head, and walls forming a conduit for conveying iuid being pumped from the impeller to said scroll, and packing means for preventing leakage of fluid along the shaft to said bearing, said packing means comprising adjacent inwardly facing annular pockets one of which is connected to atmosphere and the other to the suction side of the impeller.

In witness whereof I have hereunto set my hand this 9th day of August, 1929.

SANFORD A. MOSS. 

